Breech mechanism for breech-loading guns.



No. 66l,775 Patented Nov. l3, I900.

. A. SILFVERSPARRE.

BREECH MECHANISM FOR BBEEGH LOADING GUNS.

(Application Med Aug. 15, 1900.1

(No Mode l.) 2 Sheets-Shoef J H I 12,

No. 661,775. Patented Nov. l3, I900. A. SILFVERSPARRE. BREECH MECHANISM FUR BBEECH LOADING GUNS.

(Application filed Aug. 15. 1900.

(m Model.) 2 Sheets-Sheet 2/ ullll circumference of the roll engaging in a corremechanical engineer,

'Improvements in the Breech Mechanism of of the door is arranged a sliding toothed rack UNITED STATES AROU'I SILFVERS PA RRE BREECH MECHANISM FOR PATENT OFFIC OF BOFORS, SVEDEN.

BREECH-LOADING GUNS.

SPECIFICATION forming part 01 Letters Patent NO. 661.775, dated November 13, 1900,

Application filed August 15, 1900.

To (all 1071 0711, it may cancer/t:

Be it known that 1, ABOUT SILFVERSPARRE, of Bofors, county of Wei-inland, Sweden, have invented certain Breech-Loading Guns; and I do hereby declare the nature of my invention to be as follows.

In the drawings my improved breech mechanism is illustrated in its closed position and in a longitudinal section in Figure 1 and in a rear view in Fig. 2. Fig. 3 is a longitudinal section of the breech mechanism opened. Figs. 4 to 7 illustrate some details.

The breech-screw 1, as usual, is revolubly mounted on the door 2, which by means of the vertical pin 5 is hinged at the rear end of the gun. 0n the pin 5 is mounted a roll 12, in the circumference of which is arranged a groove a, Figs. 2 to 7, the latterof which shows the groove developed in plan, said groove on a portion of its length being horizontal or nearly horizontal, while the other portion is steeply inclined. In said groove slides a pin projecting radially from the breech-screw and provided with a friction-roller 13. On the back 16, with which engages, when the door by means of the operating-lever 7, rigidly secured to the hinge-pin, is to swing outward from its closed position, a cog or tooth 22 on the roll 12, which tooth in the rotary motion of the roll shifts the rack longitudinally. During the first portion of this rotation *the friction-roller 13 slides in the horizontal portion of the roll-groove, the screw then remaining stationary; butat the continued rotation of lever 7 the friction-roller 13 enters into the inclined portion of the roll-groove, and the screw is thereby by great force compelled to rotate through a small angle, which rotation, however, issutticieut to loosen it and disengage it from the obturator 4. When this movement has taken place, a tooth 17 on the rack engages between teeth 18, arranged on the screw 1, and rotates the screw still farther at a great velocity until the motion is arrested by a stop-pin 36, arranged on the door, said pin engaging in a slot in the screw. At the continued rotation of the roll 12 While actuated by the operating-lever a tooth 14 on the Serial No. 26,909. No model.)

sponding recess 1) in the screw com pels thelatter to move reet-ilinearly rearward, guided by its neck. During the rotation and rearward motion of the screw '1 the door 2 remains locked to the gun by means of a sliding latch 9, arranged in the door paralled to the hingepin, which latch is provided at its lower end with a projection or lug c, engaging in the axially downward-pointing end portion Z of a slot- 25, arranged at the circumference of the lower ear of the hinge, and the remainder of which slot is situated in a plane perpendicular to the axis of the hinge-pini. 6., horizontally in the drawings, Figs. 4, 5, and 6, the last mentioned of which shows theslot developed in plan. The said latch 9 also at its upper end has a projection or lug c, which at the same time engages in the forwardportion of a slot 24, arranged in the roll-l2; but this portion of the slot 24 is situated ina plane perpendicular to theaxis of the hinge-pin t'. e., horizontally in the drawings-s0 that the rotation of the roll can take place without interference. When the roll has been rotated enough to complete the turning of the screw and shift it rearward, the lug c of the latch!) strikes an inclined edge of the slot 24, causing the latch to be shifted upward, so as to move its lower lug c out of its engagement with the axial portion of the slot 25 in the ear of the hinge and into its horizontal portion, while at the same time the upper lug c enters into the axially upward-pointing end portion fof the slot 24. The door is thereby disengaged from the ear of the hinge and instead locked to the roll, being thuseompelledto take part in the continued rotation of the lat- 'ter and to be swung outward, together with the screw, This couplingot' the door to the.

roll also continues during the inward motion of the door until in closing the latter is again brought close to the rear plane of the gun,

the latch 9 being then once more depressed,

into engagement with the axial, part of the slot 25, thus locking the door to the ear of the hinge. When the screw 1 is fully withdrawn, the rack 16 is retained in itseposition by the tooth 22, previously mentioned.

Having now particularly described and-aseertained the nature of my said invention and.-

in what manner the same is to be performed, I declare that what I claim is-- In breech mechanistns for breech-loading guns the combination of the breech-screw t rotatably mounted on a door 2 adapted to he swung sidewise ona vertical hinge attached to the gun, a roll 12 secured on the rotaryhinge-pin 5 and having on its circumference a slot n which on a portion of its length is horizontal while the remainder of it is inelined, a pin projecting radially frotn the breech-screw and adapted to he shifted sidewise by the inclined part of the slotand thus rotate the screw so as to loosen it from the ohtu rator 4-, a sliding toothed rack 16 arranged on the door 2 and engaging, when the door is swung outward frotn its closed position, with a cog or tooth 22 located on the roll 12 and shifting the rack longitudinally, a toothed segment 18 on the rear end of the screw 1 and engaging with the rack at its movement,

thus turning the screw still farther at a great velocity until its motion is arrested by a stoppin 34') secured on the door, a tooth 'l-t loeated on the circumference of the roll 12 and adapted to'engage, on the completion of the rotation of the screw required for its extraction, in a recess I; made in the screw, thus at the continued rotation of the screw compellinyi it. to move rectilinearly rearward guided by its neck, and a vertical sliding latch 5! ar-" ranged in the door 2, said latch hein movahle longitudinally to the hinge-pinand during the rotation and rearward motion of the screw 1 engaging, by means of a lttg a projecting from its lower end, with an axial recess ti ofa horizontal slot 25 arranged in the eireuinference of the nearest hinge-ear, thus locking the door to the gun while at the same time a lu; r: at the upper end of the latch slides in the horizontal portion of a slot 24 in the roll, the farther end portion ofwhichslot hassueh shape that dttringtho final rotation of the roll it moves the latch out of engagement with the hinge-ear and into engagement with the roll so that the door will-he disengaged from the hinge-ear,coupled to the roll and thus compelled to partake in the rotation of the latter and he moved outward together with the breech-screw.

ln witness whereof I have hereunto set'my hand in presence or two witnesses.

Al'tUU'l SlltFVERSIARRE. \Vitnessos:

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